HEPA filters in air purifiers are the new big thing these days, especially after the worldwide Coronavirus pandemic! Almost every person is resorting to these filters that promise solid results in maintaining fresh air around them. They can be used for offices, homes, parties, and many other places.
If you are interested in buying a HEPA air purifier and are confused about the ins and outs of this device, this blog is here to help. Read on to get enlightened!
What exactly is HEPA?
HEPA purifiers mean high-efficiency particulate air purifiers – they might sound complex but are pretty simple to understand. HEPA filters can capture 99.7% of the pollutants, which can be as tiny as 0.3 micrometers. This is precisely why these filters are incorporated in operating and clean rooms.
HEPA filters were created in the 1940s during the development of atomic bombs. More popularly, they are referred to as a mat of aligned fibers in random patterns – built of glass or other synthetic materials.
What kind of particles can be captured by HEPA filters?
The various particles that can be captured by HEPA filters are PM 2.5, pollen, bacteria, mold, viruses, and even pet allergens. All these particles are harmful to the human body, and the HEPA filters help in healthy living by removing these.
How does a HEPA filter work?
A HEPA air purifier has a different working process compared to the usual air purifiers. The EPA or Environmental Protection Agency maintains its standard of removing particles.
This agency is responsible for using grades divided by the United States military for such filters – beginning with A as the least effective filter to E being the most effective HEPA filter in the market.
The working mechanism can be similar to a web, strainer, or sieve but is far more intricate and catches the smallest particles in the air.
Four-step capture process
There are four significant steps in the HEPA filter process: impaction, interception, diffusion, and electrostatic attraction. The particle trapping process goes complicated with each step, managing to capture the tiniest of airborne stuff.
Let’s start with the first step – impact. The fibers of the HEPA filters capture dirt and dust particles in four different ways. The first one is by some particles crashing into the filter fibers and being absorbed by impaction.
Others are caught with their flow in the moving air stream, moving too close to fiber, and are captured in the second step – interception. Some particles travel at lower speeds and are trapped through diffusion. Diffusion is the process of crashing between random air particles and fusion into each other and, thus, pushing into the filter fibers.
Lastly, we have the electrostatic attraction process where minuscule particles like dust in smoke are trapped. You might not know, but these particles come with an electrostatic charge. So, when the positive charges and negative charges come close, they produce electrostatic attraction.
In the final stage of the HEPA air filter process, the electrostatically charged filters attract these small particles towards themselves and catch them.
If you or your knowns are planning to buy air purifiers, it is strongly recommended to go for those with HEPA air filters. Moreover, check out the prices and offers on the top brands to purchase the purifier at the best price.